ANDNOT operation

Author: Maratyszcza

proposals/simd/BinarySIMD.md

@@ -189,3 +189,4 @@ The `v8x16.shuffle` instruction has 16 bytes after `simdop`.
 | `i32x4.load16x4_u`         |    `0xd5`| m:memarg           |
 | `i64x2.load32x2_s`         |    `0xd6`| m:memarg           |
 | `i64x2.load32x2_u`         |    `0xd7`| m:memarg           |
+| `v128.andnot`              |    `0xd8`| -                  |

proposals/simd/ImplementationStatus.md

@@ -71,6 +71,7 @@
 | `f64x2.ge`                 | `-munimplemented-simd128` |                    | :heavy_check_mark: | :heavy_check_mark: |
 | `v128.not`                 |               `-msimd128` | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |
 | `v128.and`                 |               `-msimd128` | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |
+| `v128.andnot`              |                           |                    |                    |                    |
 | `v128.or`                  |               `-msimd128` | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |
 | `v128.xor`                 |               `-msimd128` | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |
 | `v128.bitselect`           |               `-msimd128` | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |

proposals/simd/SIMD.md

@@ -521,6 +521,12 @@ The logical operations defined on the scalar integer types are also available
 on the `v128` type where they operate bitwise the same way C's `&`, `|`, `^`,
 and `~` operators work on an `unsigned` type.
 
+### Bitwise AND-NOT
+
+* `v128.andnot(a: v128, b: v128) -> v128`
+
+Bitwise AND of bits of `a` and the logical inverse of bits of `b`. This operation is equivalent to `v128.and(a, v128.not(b))`.
+
 ### Bitwise select
 * `v128.bitselect(v1: v128, v2: v128, c: v128) -> v128`